I agree with John in everything, with the exception that here in AZ (and the rest of USA AFAIK) it's illegal for an electric-assisted bicycle to go faster than 20mph when using it's assist (and trying to keep up using pedals would be impossible for most people, and couldn't be done for long by anyone), so keeping up with traffic speeds is not really possible.
If it's registered/etc as a class of vehicle that in your jurisdiction *does* allow those speeds, then I would definitely recommend it as a method of minimizing rear-enders with you as the hood ornament.
Otherwise, riding defensively, assuming you are invisible, and always paying so much attention to the road that you go broke is a really good idea.
Even though my ebike is lit better than some cars and many motorcycles, and I ride very carefully by the rules of the road, including using my lighted turn signals, brake lights, etc., I still know that people don't always see me (or care, when they do), and have had some near misses that leave me shaking despite me having been watching. If I weren't paying careful attention, they wouldn't have been misses.
Because of visibility, I *prefer* riding at night, because my lighting makes people react to me as a regular vehicle, and I usually am given the whole lane, where in the daytime I get passed so close I've had my mirror moved by their passage on occasion, and when riding my regular upright bike have been sucked into the lane by their wake, or pushed off the road by their bowshock. Wind/air is not so much a problem on the CrazyBike, because it weighs so much, but I can still feel it and it does push me around, just not dangerously so. At night, the lighting keeps them away from me and generally I feel safer, though I still have to keep an eye out at all times for the one that doesn't care or isn't paying attention, which has included police vehicles and other bicycles.
You can't really trust anybody--I've been rear-ended by a few other cyclists when I stop for traffic controls, because apparently some never do, and just sail on thru, so they expected me to as well and didn't even look. Didn't hurt me or CrazyBike2, but it bent one guy's wheel, and he had to walk from there on. One of the others got mad at me for stopping, but it's required, as well as being a good idea, and he just vented for a minute and then apologized for running into me, and left.